1// Copyright David Abrahams 2002.
2// Distributed under the Boost Software License, Version 1.0. (See
3// accompanying file LICENSE_1_0.txt or copy at
4// http://www.boost.org/LICENSE_1_0.txt)
5#ifndef TO_PYTHON_INDIRECT_DWA200221_HPP
6# define TO_PYTHON_INDIRECT_DWA200221_HPP
7
8# include <boost/python/detail/prefix.hpp>
9
10# include <boost/python/object/pointer_holder.hpp>
11# include <boost/python/object/make_ptr_instance.hpp>
12
13# include <boost/python/detail/none.hpp>
14
15#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
16# include <boost/python/converter/pytype_function.hpp>
17#endif
18
19# include <boost/python/refcount.hpp>
20
21# include <boost/type_traits/is_pointer.hpp>
22# include <boost/type_traits/is_polymorphic.hpp>
23
24# include <boost/mpl/bool.hpp>
25
26# if defined(__ICL) && __ICL < 600
27# include <boost/shared_ptr.hpp>
28# else
29# include <memory>
30# endif
31
32namespace boost { namespace python {
33
34template <class T, class MakeHolder>
35struct to_python_indirect
36{
37 template <class U>
38 inline PyObject*
39 operator()(U const& ref) const
40 {
41 return this->execute(const_cast<U&>(ref), is_pointer<U>());
42 }
43#ifndef BOOST_PYTHON_NO_PY_SIGNATURES
44 inline PyTypeObject const*
45 get_pytype()const
46 {
47 return converter::registered_pytype<T>::get_pytype();
48 }
49#endif
50 private:
51 template <class U>
52 inline PyObject* execute(U* ptr, mpl::true_) const
53 {
54 // No special NULL treatment for references
55 if (ptr == 0)
56 return python::detail::none();
57 else
58 return this->execute(*ptr, mpl::false_());
59 }
60
61 template <class U>
62 inline PyObject* execute(U const& x, mpl::false_) const
63 {
64 U* const p = &const_cast<U&>(x);
65 if (is_polymorphic<U>::value)
66 {
67 if (PyObject* o = detail::wrapper_base_::owner(p))
68 return incref(o);
69 }
70 return MakeHolder::execute(p);
71 }
72};
73
74//
75// implementations
76//
77namespace detail
78{
79 struct make_owning_holder
80 {
81 template <class T>
82 static PyObject* execute(T* p)
83 {
84 // can't use auto_ptr with Intel 5 and VC6 Dinkum library
85 // for some reason. We get link errors against the auto_ptr
86 // copy constructor.
87# if defined(__ICL) && __ICL < 600
88 typedef boost::shared_ptr<T> smart_pointer;
89# else
90 typedef std::auto_ptr<T> smart_pointer;
91# endif
92 typedef objects::pointer_holder<smart_pointer, T> holder_t;
93
94 smart_pointer ptr(const_cast<T*>(p));
95 return objects::make_ptr_instance<T, holder_t>::execute(ptr);
96 }
97 };
98
99 struct make_reference_holder
100 {
101 template <class T>
102 static PyObject* execute(T* p)
103 {
104 typedef objects::pointer_holder<T*, T> holder_t;
105 T* q = const_cast<T*>(p);
106 return objects::make_ptr_instance<T, holder_t>::execute(q);
107 }
108 };
109}
110
111}} // namespace boost::python
112
113#endif // TO_PYTHON_INDIRECT_DWA200221_HPP
114

source code of boost/boost/python/to_python_indirect.hpp